KAMPE-PERSSON, Hakon; BOIKO, Dmitrijs; MORKŪNAS, Julius. Distribution and numbers of moulting non-breeding Whooper Swans Cygnus cygnus in the Baltic States and South Sweden. Ornis Svecica, Lund, Sweden, v. 22, n. 3–4, p. 127–138, 2012. DOI: 10.34080/os.v22.22588. Disponível em: https://journals.lub.lu.se/os/article/view/22588. Acesso em: 11 dec. 2023.